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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107087] [13 Regression]
 bits/stl_algobase.h:431: warning: 'void* __builtin_memcpy(void*, const void*,
 unsigned int)' reading between 8 and 2147483644 bytes from a region of size 4
 [-Wstringop-overread]
Date: Thu, 30 Mar 2023 08:31:21 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107087

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> Comment 0 comes from 22_locale/money_put/cons/3.cc
>=20
> make check RUNTESTFLAGS=3D"conformance.exp=3D22_locale/money_put/cons/3.cc
> --target_board=3Dunix/-m32"
>=20
> (but I don't see it failing now).

I was using the wrong flags, with -m32 -D_GLIBCXX_DEBUG it fails on gcc-12:

Schedule of variations:
    unix/-m32/-D_GLIBCXX_USE_CXX11_ABI=3D0

Running target unix/-m32/-D_GLIBCXX_USE_CXX11_ABI=3D0
Using /usr/share/dejagnu/baseboards/unix.exp as board description file for
target.
Using /usr/share/dejagnu/config/unix.exp as generic interface file for targ=
et.
Using /home/jwakely/src/gcc/gcc-12/libstdc++-v3/testsuite/config/default.ex=
p as
tool-and-target-specific interface file.
Running
/home/jwakely/src/gcc/gcc-12/libstdc++-v3/testsuite/libstdc++-dg/conformanc=
e.exp
...
FAIL: 22_locale/money_get/cons/3.cc (test for excess errors)
FAIL: 22_locale/money_put/cons/3.cc (test for excess errors)


And also still fails on trunk after r13-6905:

Schedule of variations:
    unix/-m32/-D_GLIBCXX_USE_CXX11_ABI=3D0

Running target unix/-m32/-D_GLIBCXX_USE_CXX11_ABI=3D0
Using /usr/share/dejagnu/baseboards/unix.exp as board description file for
target.
Using /usr/share/dejagnu/config/unix.exp as generic interface file for targ=
et.
Using /home/jwakely/src/gcc/gcc/libstdc++-v3/testsuite/config/default.exp as
tool-and-target-specific interface file.
Running
/home/jwakely/src/gcc/gcc/libstdc++-v3/testsuite/libstdc++-dg/conformance.e=
xp
...
FAIL: 22_locale/money_get/cons/3.cc (test for excess errors)
FAIL: 22_locale/money_put/cons/3.cc (test for excess errors)


Comment 1 is fixed on trunk now though, thanks.=